JP4253102B2 - Spring retainer for internal combustion engine - Google Patents
Spring retainer for internal combustion engine Download PDFInfo
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- JP4253102B2 JP4253102B2 JP2000089110A JP2000089110A JP4253102B2 JP 4253102 B2 JP4253102 B2 JP 4253102B2 JP 2000089110 A JP2000089110 A JP 2000089110A JP 2000089110 A JP2000089110 A JP 2000089110A JP 4253102 B2 JP4253102 B2 JP 4253102B2
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- spring
- retainer
- flange portion
- internal combustion
- combustion engine
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Description
【０００１】
【発明の属する技術分野】
本発明は、内燃機関用の動弁機構に組付けられるスプリングリテーナに係り、特に、バルブスプリングの上端が圧接するばね受けフランジ部の下面の摩耗を小さくしうるようにしたスプリングリテーナに関する。
【０００２】
【従来の技術】
図４は、内燃機関の動弁機構の一例を示すもので、エンジンバルブ(１)の上端部には、半割円筒形をなす１対のコッタ(２)(２)を介して、スプリングリテーナ(以下、リテーナと略称する)(３)が止着されている。
【０００３】
リテーナ(３)における上端のばね受けフランジ部(3a)の下面とのシリンダヘッド(図示略)との間には、バルブスプリング(４)が縮設され、エンジンバルブ(１)は、リテーナ(３)を介して常時上向きに付勢されている。
(５)は、エンジンバルブ(１)の軸端に当接しているロッカアームで、これが回転カム(図示略)により上下に揺動させられることにより、エンジンバルブ(１)は開閉される。
【０００４】
このような動弁機構に用いられる従来のリテーナ(３)におけるばね受けフランジ部(3a)の下面は、リテーナ(３)の軸線と直交する水平面とされ、バルブスプリング(４)の組付け時において、その上端の平坦面と面で接触するようにしてある。
【０００５】
【発明が解決しようとする課題】
リテーナ(３)におけるばね受けフランジ部(3a)の下面は、エンジンバルブ(１)の着座時の振動等によるバルブスプリング(４)の相対回動、又は径方向への移動により、摩耗するのは避けられない。
【０００６】
特に、加・減速が頻繁に行われる自動車用のエンジンにおいては、図５に示すように、バルブスプリング(４)が圧縮された際、最上端の１巻き目が矢印のように外向きにねじれたり、ばね受けフランジ部(3a)が圧縮時の反力により上向きに撓むことがある。
このようになると、ばね受けフランジ部(3a)の下面を水平面とした従来のリテーナ(３)では、スプリング上端の平坦面をなす１巻き目の内径側の周縁部が、ばね受けフランジ部(3a)の下面と偏当たりし、その部分に大きな面圧が作用する。
【０００７】
その結果、図６に示すように、初期の運転時においてばね受けフランジ部(3a)の基部内周側が局部的に大きく摩耗し、次第に２点鎖線のように外周方向に摩耗が進行するようになる。特に、軽量化を目的としたアルミニウム合金製のリテーナ(３)では、上記摩耗の進行は大きくなる。
【０００８】
この摩耗量が大きくなると、バルブスプリング(４)のセット荷重が小さくなって、そのサージングの限界回転数が低下し、エンジン性能に悪影響を及ぼすため、摩耗の程度によっては、リテーナ(３)を交換する必要が生じる。
【０００９】
本発明は、上記問題点に鑑みてなされたもので、ばね受けフランジ部の下面の形状を改変することにより、その基部側の摩耗を小さくし、耐久性及び信頼性に優れる内燃機関用スプリングリテーナを提供することを目的としている。
【００１０】
【課題を解決するための手段】
本発明によると、上記課題は、次のようにして解決される。
(１) バルブスプリングの上端を受支するばね受けフランジ部を備える内燃機関用スプリングリテーナにおいて、前記ばね受けフランジ部の下面を、下向きに膨出する円弧状の湾曲面とし、この湾曲面に、前記バルブスプリングの上端面の中間部が当接するようにする。
【００１１】
(２) バルブスプリングの上端を受支するばね受けフランジ部を備える内燃機関用スプリングリテーナにおいて、前記バルブスプリングの上端の１巻き目の内径側の縁部が進入可能で、かつバルブスプリングが径方向に最大限移動しても、前記上端の１巻き目の内径側の縁部が外方へ外れないような大きさの幅とした上向き環状の逃げ溝を設ける。
【００１２】
(３) 上記(２)項において、逃げ溝の断面を円弧状とする。
【００１３】
【発明の実施の形態】
以下、本発明の第１の実施形態を、図面に基づいて説明する。
図１において、本発明のリテーナ(６)は、アルミニウム合金(例えばＡl−Ｓi系、Ａl−Ｃu系)により成形したのち、ＪＩＳに基づくＴ６処理(溶体化時効処理)を施して形成され、中心にコッタ(図示略)が嵌合されるテーパ孔(７)を備える筒部(6a)と、中間フランジ部(6b)と、それより薄肉の、バルブスプリング(４)の上端を受支するばね受けフランジ部(6c)とを有している。
【００１４】
図２に拡大して示すように、ばね受けフランジ部(6c)の下面(８)は、下向きに膨出するなだらかな円弧状断面の湾曲面としてある。
【００１５】
このように、ばね受けフランジ部(6c)の下面(８)を湾曲面とすると、エンジンの加・減速運転時等においてバルブスプリング(４)の上端の１巻き目がリテーナ(６)により圧縮されて外向きにねじれたり、あるいは、ばね受けフランジ部(6c)が上向きに撓むなどしても、図２に示すように、バルブスプリング(４)の内径側の縁部が、下面(８)の基部内周側に接触することがなくなる。
【００１６】
従って、従来のように、ばね受けフランジ部(6c)の基部側の面圧が大となって、その部分を局部的に大きく摩耗させることはなく、また基部を中心として下面(８)全体が広範囲に摩耗することもない。
【００１７】
その結果、バルブスプリング(４)のセット荷重が小さくなり、そのサージングの限界回転数が低下するのが防止され、エンジン性能は長期間に亘り良好な状態に維持される。
【００１８】
図３は、本発明の第２の実施形態を示すもので、ばね受けフランジ部(6c)の下面(８)の中央部を、下向きに膨出するほぼ逆台形断面形状とし、かつ中間フランジ部(6b)とばね受けフランジ部(6c)との連設隅部に、上向き環状の逃げ溝(９)を形成してある。
【００１９】
上記逃げ溝(９)の径方向の幅は、バルブスプリング(４)が径方向に最大限移動しても、その上端の１巻き目の内径側の縁部が、逃げ溝(９)の形成領域より外方へ外れない大きさとしてある。
【００２０】
この第２の実施形態においても、バルブスプリング(４)が外向きにねじれるなどすると、その内径側の縁部が逃げ溝(９)内に進入し、かつ縁部と下面(８)の基部との間には隙間が形成されるため、ばね受けフランジ部(6c)の基部内周側を局部的に摩耗させることはない。
【００２１】
なお、上記第２の実施形態において、ばね受けフランジ部(6c)の下面(８)を逆台形をなす断面形状としないで、単に逃げ溝(９)のみを形成してもよい。
【００２２】
また、逃げ溝(９)は、その部分に応力が集中するのを防止するために、比較的大きい曲率半径の円弧状断面とするのがよい。
【００２３】
本発明は、上述のように、比較的軟質のアルミニウム合金製のリテーナに適用すると効果的であるが、通常の鋼製のリテーナにも適用しうることは勿論である。
【００２４】
【発明の効果】
請求項１記載の発明によれば、バルブスプリングの上端の１巻き目が外向きにねじれたり、ばね受けフランジ部が上向きに撓むなどしても、バルブスプリングの内径側の縁部が、ばね受けフランジ部の下面の基部内周側に接触することがなくなるので、その部分に大きな面圧が作用するのが防止される。
その結果、ばね受けフランジ部の基部内周側の初期摩耗が防止されるとともに、下面全体の摩耗の進行も小さくなり、スプリングリテーナの耐久性及び信頼性が向上する。
【００２５】
請求項２記載の発明によれば、バルブスプリングの上端の１巻き目が外向きにねじれるなどしても、その内径側の縁部は逃げ溝内に進入し、かつばね受けフランジ部の基部との間には隙間が形成されるため、その部分に大きな面圧が作用して摩耗を増大させることはなくなる。
【００２６】
請求項３記載の発明によれば、逃げ溝を形成した部分に大きな応力が作用するのを防止しうる。
【図面の簡単な説明】
【図１】 本発明のスプリングリテーナの第１の実施形態を示す中央縦断正面図である。
【図２】 同じく、拡大半断面図である。
【図３】 本発明のスプリングリテーナの第２の実施形態を示す拡大半断面図である。
【図４】 従来のスプリングリテーナを備える動弁機構の中央縦断正面図である。
【図５】 同じく、バルブスプリングがねじれた際の接触状態を示す要部の拡大断面図である。
【図６】 同じく、ばね受けフランジ部の摩耗状態を示す要部の拡大断面図である。
【符号の説明】
(４)バルブスプリング
(６)スプリングリテーナ
(6a)筒部
(6b)中間フランジ部
(6c)ばね受けフランジ部
(７)テーパ孔
(８)下面
(９)逃げ溝[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spring retainer assembled in a valve mechanism for an internal combustion engine, and more particularly to a spring retainer that can reduce wear on the lower surface of a spring receiving flange portion that is pressed against the upper end of a valve spring.
[0002]
[Prior art]
FIG. 4 shows an example of a valve operating mechanism of an internal combustion engine. A spring retainer is connected to the upper end portion of the engine valve (1) via a pair of cotters (2) and (2) that form a half cylinder. (Hereinafter abbreviated as a retainer) (3) is fixed.
[0003]
A valve spring (4) is contracted between the retainer (3) and the cylinder head (not shown) of the upper end of the spring receiving flange (3a) at the upper end, and the engine valve (1) is connected to the retainer (3). ) Is always urged upwards.
(5) is a rocker arm that is in contact with the shaft end of the engine valve (1). When the rocker arm is swung up and down by a rotating cam (not shown), the engine valve (1) is opened and closed.
[0004]
The lower surface of the spring receiving flange portion (3a) in the conventional retainer (3) used in such a valve mechanism is a horizontal plane perpendicular to the axis of the retainer (3), and when the valve spring (4) is assembled. The upper end is in contact with the flat surface at the upper end.
[0005]
[Problems to be solved by the invention]
The lower surface of the spring receiving flange portion (3a) of the retainer (3) is worn due to relative rotation of the valve spring (4) due to vibration or the like when the engine valve (1) is seated or movement in the radial direction. Inevitable.
[0006]
In particular, in an automobile engine where acceleration / deceleration is frequently performed, as shown in FIG. 5, when the valve spring (4) is compressed, the first winding at the uppermost end is twisted outward as indicated by an arrow. Or the spring receiving flange portion (3a) may bend upward due to a reaction force during compression.
In this case, in the conventional retainer (3) in which the lower surface of the spring receiving flange portion (3a) is a horizontal surface, the peripheral portion on the inner diameter side of the first winding forming the flat surface at the upper end of the spring is the spring receiving flange portion (3a). ), And a large surface pressure acts on that portion.
[0007]
As a result, as shown in FIG. 6, the base inner peripheral side of the spring receiving flange portion (3a) is locally heavily worn during the initial operation, and gradually wears in the outer circumferential direction as indicated by a two-dot chain line. Become. In particular, in the retainer (3) made of an aluminum alloy for the purpose of weight reduction, the progress of the wear becomes large.
[0008]
If this amount of wear increases, the set load of the valve spring (4) will decrease, and the surging limit rotational speed will decrease, adversely affecting engine performance. Depending on the degree of wear, the retainer (3) must be replaced. Need to do.
[0009]
The present invention has been made in view of the above problems, and by modifying the shape of the lower surface of the spring receiving flange portion, the wear on the base side is reduced, and the spring retainer for an internal combustion engine that is excellent in durability and reliability. The purpose is to provide.
[0010]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) In a spring retainer for an internal combustion engine that includes a spring receiving flange portion that supports and supports the upper end of a valve spring, the lower surface of the spring receiving flange portion is an arcuate curved surface that bulges downward , An intermediate portion of the upper end surface of the valve spring is brought into contact .
[0011]
(2) In a spring retainer for an internal combustion engine having a spring receiving flange portion that supports and supports the upper end of the valve spring, the inner edge of the first turn of the upper end of the valve spring can enter , and the valve spring is in the radial direction An upward annular relief groove having a width such that the edge on the inner diameter side of the first winding of the upper end does not come outward even when moved to the maximum is provided.
[0012]
(3) In the above item (2), the cross section of the escape groove is arcuate.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
In FIG. 1, the retainer (6) of the present invention is formed by forming a T6 treatment (solution aging treatment) based on JIS after molding with an aluminum alloy (for example, Al-Si system, Al-Cu system). A cylindrical portion (6a) having a tapered hole (7) into which a cotter (not shown) is fitted, an intermediate flange portion (6b), and a spring which is thinner than that and which supports the upper end of the valve spring (4) And a receiving flange portion (6c).
[0014]
As shown in FIG. 2 in an enlarged manner, the lower surface (8) of the spring receiving flange portion (6c) is a curved surface having a gentle arcuate cross section that bulges downward.
[0015]
Thus, when the lower surface (8) of the spring receiving flange (6c) is a curved surface, the first turn of the upper end of the valve spring (4) is compressed by the retainer (6) during acceleration / deceleration operation of the engine. As shown in FIG. 2, even if the spring receiving flange portion (6c) bends upward, the edge on the inner diameter side of the valve spring (4) remains on the lower surface (8). No contact with the inner periphery of the base.
[0016]
Therefore, unlike the conventional case, the surface pressure on the base side of the spring receiving flange portion (6c) is increased, and the portion is not greatly worn locally, and the entire lower surface (8) is centered on the base portion. It does not wear extensively.
[0017]
As a result, the set load of the valve spring (4) is reduced and the surging limit rotational speed is prevented from being lowered, and the engine performance is maintained in a good state for a long period.
[0018]
FIG. 3 shows a second embodiment of the present invention, wherein the center portion of the lower surface (8) of the spring bearing flange portion (6c) has a substantially inverted trapezoidal cross-sectional shape that bulges downward, and an intermediate flange portion. An upward annular relief groove (9) is formed at the corner of the continuous connection between (6b) and the spring bearing flange (6c).
[0019]
The radial width of the relief groove (9) is such that even if the valve spring (4) moves to the maximum in the radial direction, the edge on the inner diameter side of the first winding at the upper end forms the relief groove (9). The size is such that it does not come out of the area.
[0020]
Also in the second embodiment, when the valve spring (4) is twisted outward, the edge on the inner diameter side enters the escape groove (9), and the edge and the base of the lower surface (8) Since a gap is formed between them, the inner peripheral side of the base portion of the spring receiving flange portion (6c) is not locally worn.
[0021]
In the second embodiment, the lower surface (8) of the spring receiving flange portion (6c) may not be formed into a reverse trapezoidal cross section, and only the relief groove (9) may be formed.
[0022]
The escape groove (9) is preferably an arc-shaped cross section having a relatively large radius of curvature in order to prevent stress from concentrating on the portion.
[0023]
As described above, the present invention is effective when applied to a retainer made of a relatively soft aluminum alloy, but of course can also be applied to an ordinary steel retainer.
[0024]
【The invention's effect】
According to the first aspect of the present invention, even if the first winding of the upper end of the valve spring is twisted outward or the spring receiving flange portion is bent upward, the edge on the inner diameter side of the valve spring is Since no contact is made with the base inner peripheral side of the lower surface of the receiving flange portion, it is possible to prevent a large surface pressure from acting on that portion.
As a result, initial wear on the inner peripheral side of the base portion of the spring receiving flange portion is prevented, and the progress of wear on the entire lower surface is reduced, thereby improving the durability and reliability of the spring retainer.
[0025]
According to the second aspect of the present invention, even if the first winding of the upper end of the valve spring is twisted outward, the edge on the inner diameter side enters the escape groove, and the base of the spring receiving flange portion Since a gap is formed between the two, a large surface pressure does not act on that portion and wear is not increased.
[0026]
According to invention of
[Brief description of the drawings]
FIG. 1 is a central longitudinal sectional front view showing a first embodiment of a spring retainer of the present invention.
FIG. 2 is an enlarged half sectional view of the same.
FIG. 3 is an enlarged half sectional view showing a second embodiment of the spring retainer of the present invention.
FIG. 4 is a central longitudinal front view of a valve operating mechanism having a conventional spring retainer.
FIG. 5 is an enlarged cross-sectional view of a main part showing a contact state when the valve spring is similarly twisted.
FIG. 6 is an enlarged cross-sectional view of the main part showing the worn state of the spring receiving flange part.
[Explanation of symbols]
(4) Valve spring
(6) Spring retainer
(6a) Tube part
(6b) Intermediate flange
(6c) Spring bearing flange
(7) Taper hole
(8) Bottom surface
(9) Escape groove
Claims (3)
前記ばね受けフランジ部の下面を、下向きに膨出する円弧状の湾曲面とし、この湾曲面に、前記バルブスプリングの上端面の中間部が当接するようにしたことを特徴とする内燃機関用スプリングリテーナ。In a spring retainer for an internal combustion engine comprising a spring receiving flange portion for receiving and supporting the upper end of a valve spring,
A spring for an internal combustion engine , wherein the lower surface of the spring receiving flange portion is formed into an arcuate curved surface that bulges downward, and an intermediate portion of the upper end surface of the valve spring is in contact with the curved surface. Retainer.
前記ばね受けフランジ部の下面における内周部に、前記バルブスプリングの上端の１巻き目の内径側の縁部が進入可能で、かつバルブスプリングが径方向に最大限移動しても、前記上端の１巻き目の内径側の縁部が外方へ外れないような大きさの幅とした上向き環状の逃げ溝を設けたことを特徴とする内燃機関用スプリングリテーナ。In a spring retainer for an internal combustion engine comprising a spring receiving flange portion for receiving and supporting the upper end of a valve spring,
Even if the edge on the inner diameter side of the first winding of the upper end of the valve spring can enter the inner peripheral portion of the lower surface of the spring receiving flange portion and the valve spring moves to the maximum in the radial direction, A spring retainer for an internal combustion engine, comprising an upward annular relief groove having a width such that an edge on the inner diameter side of the first winding does not come outward .
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000089110A JP4253102B2 (en) | 2000-03-28 | 2000-03-28 | Spring retainer for internal combustion engine |
| US09/661,713 US6293240B1 (en) | 2000-03-28 | 2000-09-14 | Valve spring retainer and a valve operating mechanism |
| EP00120383A EP1143114B1 (en) | 2000-03-28 | 2000-09-18 | Valve spring retainer and a valve operating mechanism |
| DE60026413T DE60026413T2 (en) | 2000-03-28 | 2000-09-18 | Valve spring attachment and valve train mechanism |
| US09/921,742 US6341588B2 (en) | 2000-03-28 | 2001-08-03 | Valve spring retainer and a valve operating mechanism |
| US09/921,468 US6311661B1 (en) | 2000-03-28 | 2001-08-03 | Valve spring retainer and a valve operating mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000089110A JP4253102B2 (en) | 2000-03-28 | 2000-03-28 | Spring retainer for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001271618A JP2001271618A (en) | 2001-10-05 |
| JP4253102B2 true JP4253102B2 (en) | 2009-04-08 |
Family
ID=18604901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000089110A Expired - Fee Related JP4253102B2 (en) | 2000-03-28 | 2000-03-28 | Spring retainer for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4253102B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4666904B2 (en) * | 2003-11-27 | 2011-04-06 | 株式会社不二工機 | Expansion valve |
-
2000
- 2000-03-28 JP JP2000089110A patent/JP4253102B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001271618A (en) | 2001-10-05 |
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